Download or read book Aging Phenomena in Columbium base Alloys written by D. O. Hobson and published by . This book was released on 1962 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Solutioning and Aging Reactions and Their Effect on Hardness and Microstructure in Some Columbium Base Alloys written by Naresh Chandra Birla and published by . This book was released on 1972 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was made to investigate the solutioning and aging reactions and their effects on microstructure and hardness in twenty-four experimental columbium-base alloys, involving Cb-C, Cb-Si-C, Cb-15Hf-C, Cb-15Hf-C-Si, Cb-33Hf-C and Cb-33Hf-C-Si systems. The aging reactions in the Cb-15Hf-C, Cb-15Hf-C-Si, and Cb-33Hf-C-Si alloys are characterized by precipitation of the complex monocarbide (Cb, Hf) (C, O, N) phase. Replacement of some of the carbon by silicon in the Cb-15Hf-1C alloys raises the overaging temperature from 800 C to 1000 C and leads to strength retention for longer times than the alloys which contain carbon only. (Author).
Download or read book A Preliminary Study of the Aging Behavior of Wrought Columbium 1 Zirconium Alloys written by David O. Hobson and published by . This book was released on 1961 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Precipitates in Two Carbon containing Columbium base Alloys written by F. Ostermann and published by . This book was released on 1966 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The precipitates in the commercial columbium alloys D-31 and D-43 were investigated after various heat treatments. The titanium-rich and zirconium-rich monocarbides are the only stable precipitate phases in alloys D-31 and D-43, respectively. The temperatures for complete solid solution are 1600C for alloy D-31 and 1700C for alloy D-43 corresponding to a carbon content of about 0.09 wt.-%. Non-equilibrium columbium carbides precipitate even during quenching from solid solution, so that no appreciable carbon supersaturation can be achieved in columbium alloys. During aging, the stable monocarbides form at the expense of the non-equilibrium columbium carbides but not from solid solution. Therefore, age-hardening caused by stable MC-phase precipitation does not occur. The effect of oxygen on carbide precipitates was investigated by increasing the oxygen concentration of the alloys on purpose. Oxygen behaved differently in both alloys with respect to precipitate phases. A columbium carbide phase with unknown lattice structure but a composition corresponding approximately to Cb3C2 was found in both alloys after suitable heat treatments.
Download or read book Effect of Oxygen and Nitrogen on Workability and Mechanical Properties of Columbium written by R. T. Begley and published by . This book was released on 1960 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, considerable effort is being devoted to the development of columbium-base alloys for high-temperature structural applications. Because of its high melting point (2468 C), intermediate density (8.57 g per cu cm), generally good ductility, attractive high-temperature strength, and low ductile-brittle transition range, columbium has considerable potential as a base for high-temperature alloys. One of the difficulties associated with the melting, processing, and application of columbium is its reactivity with atmospheric gases, even at moderately elevated temperatures. The workability and mechanical properties of the metal are seriously affected by the gaseous impurity level. The work described in this paper was undertaken to provide data concerning the effect of oxygen and nitrogen additions on the hardness, workability, strain hardening characteristics, and recrystallization behavior of columbium. The solid solubility of oxygen in columbium is quite high compared to that of most of the other refractory metals. Seybolt [1] reported the primary solid solubility to be 0.25 and 1.0 per cent by weight at 775 and 1100 C respectively. Recent work by Elliott [2] indicates a solubility of 0.25 per cent by weight of oxygen at 500 C, and a maximum solubility of 0.72 per cent by weight at 1915 C. Three oxides, CbO, CbO2, and Cb2O5, exist in the system. A eutectic reaction occurs between the ?-columbium primary solid solution and CbO at 10.5 per cent by weight of oxygen and 1915 C. Oxygen has a pronounced effect on the room temperature hardness and tensile properties of columbium. Tottle [3] has reported that increasing the oxygen content of columbium from 0.03 to 0.41 per cent by weight raises the ultimate tensile strength from 41,000 to 131,250 psi, and the hardness from 87 to 331 diamond pyramid hardness. Several investigators [4,5,6] have observed repeated yielding and the return of the yield point on aging in columbium, which are indicative of strain aging. Earlier work by the authors [6] indicated that oxygen was the interstitial element responsible for the observed strain-aging phenomena.
Download or read book Refractory Metal Alloys Metallurgy and Technology written by I. Machlin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.
Download or read book NASA Technical Note written by and published by . This book was released on 1975 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications Reports and Papers for 1961 from Oak Ridge National Laboratory written by Oak Ridge National Laboratory and published by . This book was released on 1964 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Size Effects and Interstitial Impurities in Nb3Zr Superconductors written by J. O. Betterton and published by . This book was released on 1962 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Temperature Chemical Stability of Refractory Base Alloys in High Vacuum written by and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal and Mechanical Treatments for Nickel and Some Nickel base Alloys Effects on Mechanical Properties written by Albert M. Hall and published by . This book was released on 1972 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Columbus Laboratories, Battelle Memorial Institute, originally prepared these reports in 1965 and later revised them, updating the information to include the latest technology through 1968. This report is one of a series pertaining to the fabricating of nickel, nickel-base, and cobalt-base alloys. This report deals with heat treating and working nickel and nickel-base alloys, and with the effects of these operations on the mechanical properties of the materials. The subjects covered are annealing, solution treating, stress relieving, stress equalizing, age hardening, hot working, cold working, combinations of working and heat treating (often referred to as thermomechanical treating), and properties of the materials at various temperatures. The equipment and procedures used in working the materials are discussed, along with the common problems that may be encountered and the precautions and corrective measures that are available."--Foreword.
Download or read book Modern Developments in Powder Metallurgy written by Henry H. Hausner and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of Volume 2.- Ferrous Powder Metallurgy.- Some Aspects of the Sintering of Iron Powder.- The Mechanism of Sintering of?-Iron.- Alpha and Gamma Phase Sintering of Carbonyl and Other Iron Powders.- Investigation of the Activated Sintering of Iron Powder.- The Use of Byproduct Steel Powder from Ball-Bearing Production in Powder Metallurgy.- The Corrosion Resistance of Sintered Austenitic Stainless Steel.- Dispersion Strengthening.- Dispersion-Strengthened Nickel by Compaction and Rolling of Powder Produced by Pressure Hydrometallurgy.- On the Mechanisms of Plastic Deformation of SAP-Type Alloys.
Download or read book Ris Report written by and published by . This book was released on 1965 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Symposium on Radiation Effects on Metal and Nuetron Dosimetry written by and published by ASTM International. This book was released on with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Papers written by and published by . This book was released on 1962 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
